Grinder



2 Shets-Shet 2 Dec 27, 1938. s. F. bsslNe ET AL GRINDER Filed Aug. 22,1936 Patented Dec. 27, 193 8 [UNITE si'r' afl li GRINDER Stanley F.Ossirig and Oscar J. Feight, Columbus, Ohio, assignors to The JelireyManufacturing Company, a corporation of Ohio Application August 22,1936, Serial No. 97,436

2 Claims.

' This invention relates to a grinder and particularly' to a grinder orshredder for grinding sewage screenings or garbage.

An object of the invention is to provide an improved grinder of theabove mentioned class which will beeffe'ctive to reduce all of thematerial to a fine or shredded state while keeping the grinding elementsof the device free from material at all times, thus providing a very-efficient device.

Other objects of the invention will appear hereinafter, the novelfeatures and combinations being set forth in the appended claims.

In the accompanying drawings,

m Fig. 1 is an end elevational view of the grinder comprising ourinvention;

Fig. 2 iswa side elevational view of the device of Fig. 1;

Fig. 3 is a sectional elevational view taken on the line 33 of Fig. 1looking in the direction of the arrows;

Fig. 4 is asectional elevational view taken on the line '4-4 of Fig. 2looking in the direction of the arrows; y

21 Fig. 5 is a transverse sectional elevational view taken on-the line5-5 of Fig. 3 looking in the direction of the arrows, and with rotoromitted;

Fig. 6 is a transverse sectional elevational view taken on the line 6-6of Fig. 3 looking in the direction of the arrows, and with the rotoromitted;

Fig. '7 is a plan view of the base and grating of the grinder, with therotor removed, and with parts shown in section;

Fig. 8 is a perspective view of a part of a grat- 35 ing; and

I Fig. 9 is a perspective view of a clamping and cutting bar or plate.

- The grinder comprising our invention comprises a casing or housing I!)including a base casting II and a removably attached top casing sectionor casting I2. The members II and I2 are removably attached together, asby appropriate nuts and bolts I3, to form the enclosing casing for themachine.

The base casting I I has at each side an arcuate flange I4, whichflanges I4, I4 support a screen formed by a pair of arcuate gratings I5,I5, which are of substantially duplicate construction. Each of saidgratings I5 comprises a plurality of spaced arcuate grating bars I6which are rigidly attached to a plurality of transversely extendingplates or bars I'I, preferably having sharpened noses oredges, as shownin Figs. 3 and 8. The grating bars I6 are each provided withteeth I8 on55 the inner arcuate portions, which teeth "I8 maybe formed by serratingthe inner edge thereof. It may be noted that to give strength to theteeth I8 eachhas a. radial face l9 (Fig. 8) which presents a surfacesubstantially at right angles to the direction of the forces exerted inthe grind- 5 ing. action.

The arcuate gratings I5, l5 are of similar construction and areremovably held in the base casting I I upon the flanges I4, I4 bytoothed plates 2|, 22, two of which plates-2| are positioned above 10one of the arcuate gratings at one side of the base casting II, and twoof which plates 22 are positioned above the other grating I5 at' theother side of the base casting II. That is, the plates 2| and 22 bearagainst the free or exposed ends of the gratings I5 and keep saidgratings in proper positions. Said plates 2 I and 22 are held in placein pockets HI and I22 respectively in the base casting II and at theirends and tops abut the top casting I2. positioned behind the plates 2|and 22 respectively. The plates 2| and 22 are notched to provide teeth23 and 24 respectively, which are in alignment with the teeth on thegrating bars I6 and touch the arc of the circle which is formed by saidteeth I8.

To hold the plates 2| and 22 in the pockets I2I and I22 and to providefor their longitudinal adattached to cover plate I25 by a nut and boltI30,

theplates I21 and washers I28 extending into the pockets I 2|, I22 withsaid plates I2'I in contact with the ends of plates 2| and 22.

The top casting I2 forms a hopper 25, access to which is providedthrough an opening 26, which hopper 25 directs the material to bereduced, such asjsewage screenings or garbage, to the reducing chamber21 of the grinder.

Carried by the top casting I2 is a preliminary reducing or breaker plateor casting 28 which is provided with a flange 29 at each side thereof,the flanges 29 being attached to the side walls of the top casting I2,as by nuts and bolts 30.

The preliminary reducing or breaker. plate 28 is provided with shearingteeth 3|, the function of which is explained more in detail hereinafter.

to the tramp bin 35 is gained by a removable door Filler plates I23 andI24 are 20' 36. It may also be mentioned that the partition 33cooperates .to provide the above mentioned hopper 25, and it may berigidly attached to the top casting l2, by welding, as shown in Fig. 3.

To aid in the reducing of the sewage screenings or garbage and also toaid in keeping the interior of the grinder free of adhering putresciblematter, weprovide a perforated spray pipe 31 within the hopper 25. Y '10Within the reducing chamber 21 is provided a rotor 40 comprising a shaft4| mounted upon anti-friction bearings 42, 42 carried by appr: priatebrackets 43, 43 formed integral with the base casting H and carrying atone end a fly wheel 44, and at the other end a multiple V-belt type ofdrive pulley45.

The shaft 4|, extends through openings provided by half-sleeves 41, 41formed on the base casting H and half-cups 48, 48 carried by plates 49,49 which are rigidly attached to the top casting l2, as by welding.It'may bementioned that no material flows out through these openings dueto the centrifugal action of the rotor 40 on the material. Thiscentrifugal action also prevents material passing down between saidrotor 40; and casing walls without undergoing a reducing action, Spacerplates 50, '50 are interposed between the plates 49, 49 and the sidewalls of the top casting l2, and welded to each, to provide room for therotor construction as hereinafter described Adjacent the forward portionof the grinder, filler plates |50 (Fig. attached by nuts and bolts |5|,are provided.

Mounted upon the shaft 4| is a plurality of stacked discs or plates 5|and 52,..said plates 5| being stacked alternately, and being rigidlyattached together by tie bolts 53. Each of the stacked discs or "plates5| and 52 is provided with a plurality of shearing and grinding teethseen at 54 and 55, respectively. which teeth may be formed byserratingthe plate edges axially. The

leading edges of teeth 54 and 55 are-radial and therefore are parallelwith the previously men- -tioned surfaces |9 of teeth |8 when adjacentthereto, thus cooperating therewith to shear and grind the material andthereby efiect an efiicient reduction thereof.

It is to be particularly noted that the plates 5| have a larger diameterthan the plates 52 and that the teeth 54 travel in a circle, whenrotated, such that they pass between the teeth l8 of the grating barsl6, as best illustrated in Fig. 4 of the drawings. The diameter of thecircle described by the teethv 55 of plates 52 in rotation is less thanthatdescribed by the teeth 54 and said teeth 55 rotate in alignment-withthe grating bars Hi, there being only a very small clearance between thetips of the teeth 55 of the discs 52 and the teeth l8 of the gratingbars I6,

' continuous teeth such, for example, as one-eighth of an inch.

As clearly seen in Fig. 3 of the drawings, the teeth 3| on the reducingplate or casting 28 are spaced sufficiently away from the axis ofrotation of the rotor 40. that there is no overlapping or interleavingbetween the teeth 54 of the discs 5| and said teeth 3|, as said teethare straight extending completely across casting 28. V

In the operation of the device comprising our invention, material to beground orshredded, such as sewage screenings or garbage, will be fedinto the hopper 25 through the opening 26, and will be directed into thereducing chamber 21 where it will be encountered by the rotating rotor40 which travels in the direction of the arrow 55. 'The teeth 54. and55, and particularly the former. will encounter the material and incooperation with the teeth 3| of the preliminary reducing plate orcasting 28-will effect a pre-' liminary reduction'of' said material.Complete reduction or shredding of the material'will then be efiected bythe cooperating teeth 54 and 55, and particularly the former, incooperation with the teeth 23 and 24 of the plates 2| and 22,respectively, and more particularly in cooperation with the teeth l8 ofthe grating bars IS. The gratings l5 will act both as a-screen to retainthe material in the reduction chamber 21 until adequately reduced and asgrinding elements to cooperate with the rotor 40 to effect such grindingand reducing. Due to the overlapping relation of theteeth54 and theteeth I8, 23 and 24, there will be a very thorough shredding, grindingor reducing of the material. Furthermore, the teeth 55 in cooperationwith the teeth I8, 23 and 24 will be very effective to remove from saidteeth I8, 23 and-24 any material which tends to accumulate thereon. As aconsequence, there will be no appreciable building up of material on theteeth I8, 23 and 24 which would reduce greatly their efficiency, thuspresenting the said teeth I8, 23 and 24 substantially clean at all timeswhereby they will be 'most effective in performing their reducingoperation. The teeth 55 also cooperate with said teeth I8, 23 and 24 toreduce to a very fine state any material caught between them. Anyirreducible material, such as scrap metal or tramp iron which is engagedby the rotor 40, will be thrown through the throat 34 into the tramp bin35 where it may be removed by opening the door 36, mounted uponremovable top and bottom supports I38.

In order to insure that no material is thrown upwardly through thehopper 25 by the rotor 40, and also to prevent material flowing into thereducing chamber 21 to the right hand side, as seen in Fig. 3, whereitwould not be reduced, we provide a block 51 extending laterallycompletely. across said chamber 21 and adjacent the bottom of saidhopper, which prevents such action.

It will be evident that the top casting |2 has at its bottom and ends,portions which extend over pockets |2| and I22 and rest upon. the plates2| and 22, thus holding them rigidly against the arcuate gratings l5,l5.

By removing the nuts .|3, |3 the top casting l2 may he slid to the left,as viewed in Fig. 2, after a removable plate 58 is removed to free theplates 2| and 22, after which they may be removed by hand, permittingthe removal of the gratings l5, l5 by sliding them arcuately around therotor 40 on the flanges I4, |4 without removing said rotor 4|]. Thisprovides for ready renewal of the gratings l5, l5 and the plates -2| and22 without requiring the removal of the rotor 40. To provide access tothe bottom of the grinder a removable door 60 may also be provided.Removable side plugs 6| and 62 also provide access thereto from thesides of the casting It is thus seen that a grinder is provided which isparticularly adapted for grinding sewage screenings or garbage;preferably with the aid of water, which grinder is very efiicient inthat the grinding elements are maintained free of any clogging matter atall times.

Obviously those skilled in the art may make hereto appended,-and wetherefore wish-not to be restricted'to the precise constructionhereindisclosed. Having thus described and shown an embodiment of ourinvention, what we desire to secure by Letters Patent of the UnitedStates is:

1. In agrinder, the combination with a casing, of a rotor mounted forrotation in said casing, said rotor including a shaft and a plurality ofstacked plates carrying teeth at their edges, the teeth of alternateplates describing circles of different diameters when rotated, andlaterally I spaced toothed grating bars in the bottom of said casingforming a grating through which reduced material can pass and positionedso the teeth of some said plates pass between adjacent bar teeth whilethe teeth of other plates are aligned with other plate teeth, when saidrotor is rotated, said grating bars being constructed and arranged toprovide uninterrupted arcuate openings extending over arcs of not lessthan ten degrees through which reduced sewage screenings pass under theinfluence of the teeth which travel between adjacent grating bars.

- 2. In a grinder, the combination with a rotor having a plurality ofrows of teeth which travel paths of different diameters, of a casingwithin which said rotor is mounted, a plate having teeth with a sharpfront cutting edge aligned with the rows of rotor teeth which travel thecircles of lesser diameter while the rotor teeth of greater diameterpass through the teeth space of said plate, and a grating in the bottomof said casing having teeth cooperating with said rotor teeth andproviding an opening through which reduced material passes.

' STANLEY F. OSSING.

* OSCAR J. FEIGHT.

